.layout {
  .header {
    height: 50px;
    background-color: skyblue;

    span {
      padding: 10px 20px;
      cursor: pointer;
      line-height: 50px;
    }
    span.on {
      color: blue;
    }
  }
  .nav {
    span {
      display: inline-block;
      padding: 10px 20px;
      cursor: pointer;
      a {
        text-decoration: none;
      }
      .on {
        color: red;
      }
    }
  }
}
